Arrangement for avoiding reflections of sound inside buildings



Sept. 11, 1928. 1,684,078

1 G. VON ARGO,

ARRANGEMENT FOR AVOIDING REFLECTIONS OF SOUND INSIDE BUILDINGS Filed June 25, 1924 1. 1 FA a A INVENTOR GEORG VON ARCO A ORNEY Patented Sept. 11, 1928.

PATENT OFFICE.

UNITED STATES GEORG VON ARGO, OF BERLIN, GERMANY, ASSIGNOR TO GESELLSCHAF'J. Fl' 'R DBAHT- LOSE TELEGBAIHIE M. B. 11., OF BERLIN, GERMANY, A, CORPORATION OF GER- MANY.

ARRANGEMENT FOB AVOIDING REFLECTIONS OF SOUND INSIDE BUILDINGS.

Application filed June 25, 1924, Serial No. 722,423, and in Germany July 25, 1923.

It is a known phenomenon that the snow on the ground causes a strong acoustic damping, so that all disturbing reflections of sound and all resonances and alterations of sound are avoided. This phenomenon is obviously based upon the fact that the snow represents a kind of system of thin tubes into which the acoustic oscillations enter and thus are damped.

The principle of the present invention is to use this phenomenon by covering the inside of the rooms with a substance, the structure of which approaches that of natural snow.

Up till now cloths, cork or similar expensive materials were nearly always used for this purpose, that is, for damping sound waves. These materials are, however, expensive and liable to catch tire.

The object of the present invention is to provide a covering for a wall that will absorb and dissipate all of the sound waves, and resonances which enter the wall.

Other objects and advantages will become apparent from the specification when read with the drawings in which, Fig. 1 is a sectional view showing a sound deadening wall constructed in accordance with the present invention, and Fig. 2 is an elevation of the same wall parts of which are broken away to clearly show the structure.

On the drawings a is the supporting wall which may be of any material, I) is a layer of wire cloth or other material fixed to the suporting wall, 0 is a la er of asbestos flakes 86 oosely spread on the ayer b. X is an air space, and Y is a support for a second layer of wire cloth or other material, I) on which the outer layer a of asbestos flakes is loosely spread.

. According to the present invention, a kind 40 of artificial snow, for instance, asbestos flakes mixed witha suitable binding means is produced. This substance is loosely spread over the inside of the room in which the acoustic damping is desired in one or more layers separated by air. The application of this substance, the structure of which is well adapted for this purpose with regard to. acoustic effects, guarantees other advantages, namely, that the danger of fire of the usual arrangements is avoided by the use of this fire proof material, and that an acoustic wall built in accordance with my invention is less expensive than acoustic Walls now in use.

Having described my invention, I claim:

1. An acoustic wall comprising a supporting layer and a oating of flaky sound absorbing material having suitable binding material carried by said layer.

2. A wall having a sound absorbing surface which comprises a supporting backing and a layer of flaky asbestos carried thereby.

3. A wall having a sound absorbing surface which comprises a supporting backing and a layer of flaky asbestos having a suitable binding material carried by said backing.

42 An acoustic wall comprising aplurality of supporting layers separated by an air space, and a coating of flaky non-inflammable sound absorbing material carried by each to su ortin la er.

pp g y GEORG VON ARGO. 

